Subjects will also be required to complete a short 9-question survey to determine their visual comfort before and after 1-hour of work on their own computer at your home or job during each 1-month period of the study. These short phone surveys will take less than 5-minutes to complete and will be arranged at the subject’s convenience before and after the subjects are going to be working on your computer for at least 1-hr. This survey will be repeated on five occasions. Finally, 3-months after the experimental portion of the study is completed, all subjects will be required to also answer the same short 9-question survey as you work on your computer. This will also be a phone survey and will be completed on three occasions before and after 1-hr of work on their own computer at home or job.